Folder Structure in ajaXplorer

I know I can do this using FileZilla or Cyberduck. I just drag a folder and it uploads the folder and contents, maintaining the structure. However, the place I work has blocked FTP access, so I can only use the webftp at the moment. Previously, with the netftp, I was able to upload an archive, and it maintained folder structure.

With ajaXplorer, I need to create the folder structure first, and then upload everything individually, and this is a time consuming process.

Am I missing a feature? Whenever I drag a folder to the upload window and click send, it gives me an error…